<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>其他样式</title>
    <style>
   .hover{
       font-size: 20px;
       cursor:wait;
       height: 5em;
       background-color: rgb(10, 10, 10);
       line-height: 5em; 
       display: block;
       opacity: 0.1;
   }
   .text{
       background-color: aquamarine;
       height: 100px;
       overflow: auto ;
   }
   .bag{
       background-color: blue;
       height: 140px;
   }

    </style>
</head>
<body>
    <div class="hover">hello
    </div>
    <div class="text">123
        <div class="bag"></div>
    </div>
</body>
</html>